Mechanical Performance and Failure Modes of High-Strength Adhesives in Aluminum Adherend Joints for Aerospace Applications
Baojiang Hou, Lifeng Jia, Lisheng Zhang, Bo Xu, Jie Hou
TL;DR
This paper evaluates a new high-strength adhesive for aerospace use, comparing its mechanical performance and failure behavior to conventional adhesives.
Contribution
The study systematically correlates macroscopic adhesive performance with failure mechanisms using multi-dimensional testing.
Findings
Adhesive III shows higher elastic modulus and mode-II fracture toughness compared to conventional adhesives.
Adhesive III exhibits mixed failure modes under normal loading and cohesive failure under shear loading.
All adhesives show higher normal strength than shear strength, with brittle characteristics observed.
Abstract
Focusing on the practical application requirements of adhesive-bonded structures in aerospace engineering, this study aims to investigate the mechanical performance and failure mechanisms of adhesive interfaces. Adhesive bonding, valued for its uniform load distribution, low stress concentration, superior sealing, and lightweight properties, serves as a critical joining technology in aerospace engineering. However, its reliable application is constrained by complex multimode failure issues, such as cohesive failure, interfacial debonding, and matrix damage. To address these challenges, a comprehensive evaluation of the novel high-strength epoxy adhesive Dq622JD-136 (Adhesive III) was conducted through systematic tests, including bulk tension, butt joint tension, single lap shear, compressive shear, and fracture toughness (TDCB/ENF) tests. These tests characterized its mechanical…
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Taxonomy
TopicsMechanical Behavior of Composites · Fatigue and fracture mechanics · Electronic Packaging and Soldering Technologies